OK, I've heard of TBI, I've heard of TPI, CFI and MPFI, but what in the world id PFI? My dad got an 92 DeVille woth a 4.9 V8 with PFI injection. FWD She moves though i'll tell you that

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Flowmaster,Edelbrock open filliment filter with K&N filter in it
160 stat,

 

92,

Port Fuel Injection is virtually the same as MPFI and TPI. Fuel is sprayed directly into the intake port, right behind the intake valve.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

Cool,Tannks Vader

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Flowmaster,Edelbrock open filliment filter with K&N filter in it
160 stat,

 

By the way, there is also a CPFI system - Central Port Fuel Injection. It is somewhat of a hybrid TBI system, but has he injectors scattered in the manifold after the throttle body.

SFI - Sequential Fuel Injection is much like any other port injection system, except that instead of batch-firing the injectors (in groups) each injector is opened in sequence. the improved timing makes for more accurate fuel metering and results in lower emissions, better efficiency, and more power.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

Vader, in '96 it actually became a CSPFI becuase instead of earlier versions where there was one injector and six poppets with a batch fire, there were six injectors with each one having its own poppet nozzle, and was fired sequentialy. This was used on the '96 and later Blazer/Jimmy/S10/Sonoma w/ 4.3L and the C/K series trucks and Sport Utes with 4.3/5.0/5.7. All of these were called "Vortec" engines. But now that GM uses GenIII engines in the C/K trucks, the 4.3L in the S/T trucks is all that is left with the CSPFI.

As for the Caddy, the intake looks like it has TBI, but is has a dry intake with one injector in each intake track instead of the throttle body.

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'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass,
SSM SFC, Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

GMT,

Good to hear you're still hanging in there. Thanks for the clarification. All we need is one more acronym for EFI systems and we'll have to write a service manual supplement just to interpret the names and acronyms.

We could call it "GM Electronic Fuel Injection / Special High-Intensity Training". If we only had an acronym for the title....

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

what about DFI...digital fuel injection

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Rick
90 Camaro RS 305 TBI
400 small block, Hooker 1 3/4 LTs, Random Tech Cat, Hooker aero chamber cat back on the way!!
TH700-R4 with Trans-Go shift kit (corvette servo here...but not installed yet)
MacEwen Motorsports White Gauge Overlays
14" K&N X-Stream Open Element
GTS Headlight and Taillight covers
5% Limo Tint all around
Classic White Chevy Bowtie sticker on rear window
http://www.geocities.com/esvalenz

Man if my camaro were a rice-rocket all those mods would give me what...easily 50-60 hp!!!

"Just because I've done it, doesn't mean I knew what I was doing!" - Me